One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18,22,20)(19,23,25,27)(21,28,29,24)(26,32,31,30)(1,2,6,8)(3,5,7,4)(9,10,12,14)(11,13,16,15)(17,19)(18,23)(20,27)(21,26)(22,25)(24,30)(28,32)(29,31)(1,3,6,7)(2,4,8,5)(9,10)(11,13)(12,14)(15,16)(18,20)(19,25)(21,29)(30,32)(1,4,6,5)(2,3,8,7)(9,11)(10,13)(12,16)(14,15)(17,19)(18,23)(20,27)(21,26)(22,25)(24,30)(28,32)(29,31)(1,2)(3,4)(5,7)(6,8)(17,20,22,18)(19,23,25,27)(21,28,29,24)(26,30,31,32)(1,5,6,4)(2,7,8,3)(17,21,22,29)(18,24,20,28)(19,26,25,31)(23,30,27,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.